Compression die



Aug. 26, 1947.A H. P. DUPRE- x 2,426,492

c'oMPREssIox DIE Filed Nov. 15, 1943 'INVENTOR JYem" eef'a RNEY PatentedAug. 26, 1947 COIWPRESSION DIE vHenry Peter Dupre, New York, N. Y.,assigner to Burndy Engineering Company, Inc., a corpora- AtionY of NewYork I Application November 15,

1 Claim. 1

My invention relates to a novel form of compression die for indentingthe sleeve of a connector into a conductor contained therein forsecuring the two together.

I-Iitherto such dies have been made to a size corresponding to a givendiameter of sleeve. A change of sleeve size necessitated a change in thecompression die parts. The principal object of my invention is toprovide a compression die for accommodating a variety of sleevediameters without changing parts. Other objects are to provide acompression die capable of accommodating a variety of sleeve diameterswithout damaging the sleeve by splitting it open, or thinning out thesleeve wall unduly at the bottom of the indentation.

I accomplish these and other objects and obtain my new results as willbe apparent from the device described in the following specification,particularly pointed out in the claim, and illustrated in theaccompanying drawing in which:

Fig. 1 is a side elevation of my proposed compression die.

Fig. 2 is a sectional View of the same indenting a maximum size sleeve.

Fig. 3 is a sectional view of the same indenting an intermediate sizesleeve.

Fig. 4 is a sectional view of the same indenting a minimum size sleeve.

In the drawings, I have shown a compression die ID, having a pluralityof superimposed indenting mounds II, I2 and I3 having diminishing baseareas forming annular recesses at the point of junction. That is to say,if the base of the compression die I has a transverse dimension (1, thelargest indenting mound II may have a reduced dimension l1 Projectingtherefrom, the secondary indenting mound I 2, having a further reducedbase dimension c is formed, and last, the smallest indenting mound I3,may have the smallest base (1. While three reductions of mounddimensions are shown, this is by way of example only, the use of two ormore being contemplated, depending on circumstances.

In Fig. 2, I have shown the compression die I0, and the holding die 20,within which is contained the sleeve 2l, about the conductor 2,2. Ahydraulic tool, not shown, but possibly of the type shown in the patentto Matthysse No. 2,254,613 may be used for indenting purposes.

In this large size of connector sleeve, the three concentric mounds II,I2 and I3 are used to establish the indentation. Where an intermediatesize sleeve 23, is used, only mounds I2 and I3 enter the sleeve, asshown in Fig. 3. In Fig, 4

194s, serial No. 510,426

2 the smallest sleeve 24, is entered by mound I3 only. The holding die20 may be used for the different sizes for I have found that a smallharmless flattening of these sleeves which may occur, does not interferewith such use.

Where the compression die is not depth-controlled, and descends to thesame point with each stroke, the largest size sleeve will receive thedeepest impression. In the #2 AWG size conductors, an impression up toof the diameter will not split or unduly thin out the metal at thelowest point clue to the provision of the circumferential recesses 25and 26, wherein the well dened lines of junction apparently establishesa firm grip on the metal in the recesses and carries the metal with itin its downward movement, maintaining a substantial thickness at thedeepest point. A depth of 50% of the diameter of the #8 AWG conductormay be obtained with intermediate size conductors varying between 50 and70%.

all height of the combined mounds, and the smallest and intermediateheights may be 35% of the total height. Where vthe impression die may bedepth controlled a uniform ratio of the depth of impression with respectto the diameter of the sleeve may be employed. The mounds may becircular, oval, or otherwise shaped at their base sections.

The sides of the mounds may be tapered slightly to facilitate withdrawalfrom the sleeve, and the tip of the die should be rounded to avoidcutting the metal.

I have thus described my invention, but I desire it understood that itis not confined to the particular forms or uses shown and described,

the same being merely illustrative, and that the' invention may becarried out in other ways without departing from the spirit of myinvention, and, therefore, I claim broadly the right to employ allequivalent instrumentalities coming within the scope of the appendedclaim, and by means of which, objects of my invention are attained andnew results accomplished, as it is obvious that the particularembodiments herein shown and described are only some of the many thatcan be employed to attain these objects and accomplish these results.

I claim:

An indenting tool for indenting a metal tubular sleeve to a wire, saidtool comprising a lower die part having a transversely extendingsemi-cylindrical groove for supporting a sleeve therein; alongitudinally extending indenting die having a base with encirclingsides forming a tip portion Thef smallest mound may be 16% of theeffective over-v extending from the base and circumferentially roundedon all sides from the base to the center of the tip, said tip having amaximum diameter less than the minimum diameter of the base; saidindenting die being provided with a shoulder having a flat face whichextends transversely to the longitudinal axis of the die, said shoulderconnecting said maximum diameter of the tip to the base of the indentingdie; and means for controlling the distance that the indenting die iscapable of moving into the sleeve supported in the semi-cylindricalgroove of the lower die part, to a point substantially in excess oftwice the Wall thickness of the sleeve from the bottom of thesemi-cylindrical groove, and less than the diameter of the sleeve,

HENRY PETER DUPRE.

REFERENCES CITED The following references are of record in the le ofthis patent:

Number UNITED STATES PATENTS Name Date Connery Apr. 21, 1925 Davis Mar.1, 1938 Dobrick Dec. 31, 1940 Wiegand July 25, 1933 Haller May 9, 1939Walton Nov. 8, 1881 Legere Feb. 8, 1916 Grout Jan. 4, 1887 Pinchart-Denyet al. Feb. 6, 1923 Zeh Mar. 13, 1934 Eden, Jr Aug. 4, 1936 MatthysseSept 2, 1941 Coover Oct. 22, 1872 Cadwallader, Jr May 21, 1940

